KLOE extraction of $a_{\mu }^{\pi \pi }$ in the mass range [0.35,0.95] GeV^2

Abstract

The KLOE Experiment at the $\varphi$ factory DA$\Phi$NE, has measured the cross section $\sigma (e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\gamma )$ using two different selection schemes: requiring the photon emission at small polar angle and detecting the photon at large polar angle in the calorimeter. Using a theoretical radiator function we extract the pion form factor and obtain the $\pi \pi$ contribution to the anomalous magnetic moment of the muon. Results presented here come from the analysis of 240 pb^{-1} collected in 2002, with improved systematic uncertainty with respect to the published KLOE analysis. We also include an update of the previous analysis.

arXiv commentContributed paper to Lepton Photon 2007